Samuel h



(No Model.)

I S H. BARTLETT 8v H. E. WAITE.

TELEPHONE REUEIVER.

No. 253,812. Patented Feb. 14,1882.

Fi I I WITNESSES B11261)" flttorneys Q w W @M vCo,

I UNITED- STATES PATENT OFFioE.

. SAMUEL H. BARTLETT AND HENRY WAITE, OF BRIDGEPORT, CONN,

ASSIGNORS TO CHARLES F. LIVERMORE, OF NEW YORK, N. Y.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 253,812, dated February 14:, 1882.

Application filed August 31, 1881. (No model.)

, ing had to the accompanying drawings, makin g part of this specification, in which- Figure 1 represents a section through our improved receiver; and Fig. 2 is a face view of the same, with the ear-piece removed and the diaphragm or sounding-board partly broken away. f

Our invention relates to an improvement upon what is known as the Reiss receiver, or arrangement of magnet and armature upon the side of his transmitter constituting the sounder the armature of which vibrates as the circuit is disturbed; and itconsistsin thecombination, with the Reiss magnet and armature,

of a diaphragm and ear-piece. through which the disturbances in the current are conveyed to'the ear with greater distinctness, as hereinafter explained.

In the accompanyingdrawings, Arepresents a magnet, which may be similar to that of the Reiss, referred to; or, what is preferable, it may be in the form of a single-bar magnet, adapting it to be inclosed in a suitable handle, B, having an enlarged chambered end or head, B, surrounding the coil 0 and adapted to receive a diaphragm, D, and the ear-piece E, secured thereto in any suitable manner. The handle part B of the body of the receiver has a. cylindrical bore, 1), through it, of uniform diameter, in which the magnet A rests for the greater part ot'its length, and above this,in the enlarged chambered head B, the bore or chamber is stepped or enlarged by successive annular rabbets or shoulders, the smaller chant her or portion thereof, 11, adjacent to the handle part receiving the coil on the end of the magnet, the second and larger part b receiving the arm or armature a overhanging the end of the magnet, and the third or largest portion b receiving and supporting the diaphragm D, covering said armature and the end of the magnet. 4

The arm a is made of steel or other magnetic metal in the form of a thin flat spring, the end overhanging the magnet being pro; vided with a small outwardly-projecting spur or point, a, which rests in contact with the disk or diaphragm D at or near its center, as shown. The opposite or outer end of the arm a is rigidly secured to the rabbet or shoulder b in such manner as, in its normal condition or state of rest, to support the inner end out of actual contact with the end of the magnet A. In addition to this, the magnet itself is made longitudinally adjustable in the handle by means of a thumb or set screw in the bandle'end, adapting it to be set nearer to or farther from the arm a, as may be required for securing the best possible results under the varying conditions of battery-power, &o.

The diaphragm or disk D may be of glass, mica, or other non-inductive material, being acted upon by the point a, under the retractive power of the spring arm or armature a, said point a, as the arm is attracted to or repelled by-the magnet, acting upon the diaphragm, with which it is in contact. In order to secure 7 the best results of this action the diaphragm D may be cushioned upon rings of yielding material at d in such manner as to adapt it to be adjusted with the ear-piece E-to or from the arm a, so as to make it bear with greater or less force upon the point a; or the arm a itself may be made adjustable toward and-away from the diaphragm for the same purpose.

It is not essential that the diaphragm should be of non-magnetic substance-such as those named-as very good results have been ob- 8 in combination with a diaphragm and earpiece so arranged that as the armature is retoo tracted, after being attracted by the magnet, tnre being disconnected from the magnet, but it shall act upon the diaphragm, imparting the in inductive proximity thereto. disturbances in the current thereto. In testimony whereof we "have hereunto set Having now described our invention, we our hands this 30th day of August, A. D. 1881.

In a telephone-receiver, the combination, gi lf gg fi g with the bar-magnet, coil, and a diaphragm of L f non-magnetic material, of a spring-armature Witnesses: A rigidly secured at one end and bearing at its 0. H. HANKINSON,

10 other end against the diaphragm, said arma- GEO. SAMUELS. 

